温度对厌氧氨氧化与反硝化耦合脱氮除碳的影响

采用ASBR反应器,研究了温度对厌氧氨氧化与反硝化耦合反应的短期影响.试验结果表明:耦合反应的活化能要小于单纯厌氧氨氧化反应的活化能,厌氧氨氧化与反硝化耦合反应可在一定程度上缓解低温对单纯厌氧氨氧化反应造成的消极影响,温度降低对厌氧氨氧化反应的影响大于对反硝化反应的影响.温度与耦合反应最大比反应速率的关系符合Arrhenius方程,在25~35℃时,耦合反应活化能为49.56kJ/mol,小于厌氧氨氧化反应的活化能66.18kJ/mol,且厌氧氨氧化反应为主导反应,对脱氮的贡献率约为61.29%.9~25℃时耦合反应的活化能为74.91kJ/mol,小于此温度梯度下厌氧氨氧化的活化能106.40kJ/mol,反硝化反应对脱氮的贡献率随温度的降低逐渐升高,9℃时,反硝化反应成为主导反应,对脱氮的贡献率约为75.10%.温度低于25℃时,反应器的容积氮去除速率(NRR)会受温度的影响.

Effect of temperature on simultaneous carbon and nitrogen removal by anaerobic ammonium oxidation and denitrification

An anaerobic sequencing batch reactor (ASBR) was used to investigate the short effects of temperature on nitrogen removal by anaerobic ammonium oxidation and denitrification. The activation energy of the coupled reaction contained anammox and denitrification was lower than the single reactor only contained anammox process. The coupled reaction could balance the negative effects of low temperature. Decrease in temperature had more severe effects on anammox process than denitrification process. The relationship between temperature and the maximum specific nitrogen removal rate could accord with Arrhenius equation. The activation energy of coupled reaction was 49.56kJ/mol which was lower than 66.18kJ/mol calculated by anammox reaction at 25~35℃ and anammox was the dominated reaction in the reactor whose contribution rates to nitrogen removal were 61.29%. The activation energy of coupled reaction was 74.91kJ/mol which was lower than 106.40kJ/mol calculated by anammox reaction at 9~25℃. The contribution rates made by denitrification to nitrogen removal were increased with the decreasing of temperature. Denitrification became the dominated reaction when the temperature dropped to 9℃, and its contribution rate to nitrogen removal was 75.10%. The volume of nitrogen removal rate(NRR) would be influenced by temperature when temperature was lower than 25℃.